<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>expression</title>
    <script type="text/javascript" src="../js/angularjs.js"></script>
    <script type="text/javascript" src="expression.js"></script>
</head>
<body ng-app="myApp">
    <div ng-controller="MyController">
        <input ng-model="expr" type="text" placeholder="输入表达式">
        <h2>{{parseValue}}</h2>

    </div>
</body>
</html>